Sorta relevant to both groups...
Augusta Ada King-Noel, Countess of Lovelace (and daughter of Lord Byron),
was born on this day in 1815; arguably the world's first computer
programmer and a highly independent woman, she saw the potential in
Charles Babbage's new-fangled invention.
J.F.Ossanna was given unto us on this day in 1928; a prolific programmer,
he not only had a hand in developing Unix but also gave us the ROFF
series.
Who'ld've thought that two computer greats would share the same birthday?
-- Dave
I like a challenge although it wasn't really much of it. A simple arpa
imp in yahoo spilled the beans :-)
"The Interface Message Processor (IMP) was the packet switching node
used to interconnect participant networks to the ARPANET from the late
1960s to 1989. It was the first generation of gateways, which are
known today as routers.[1][2][3] An IMP was a ruggedized Honeywell
DDP-516 minicomputer with special-purpose interfaces and software.[4]
In later years the IMPs were made from the non-ruggedized Honeywell
316 which could handle two-thirds of the communication traffic at
approximately one-half the cost.[5] An IMP requires the connection to
a host computer via a special bit-serial interface, defined in BBN
Report 1822. The IMP software and the ARPA network communications
protocol running on the IMPs was discussed in RFC 1, the first of a
series of standardization documents published by the Internet
Engineering Task Force (IETF)."
https://en.wikipedia.org/wiki/Interface_Message_Processor
Cheers,
uncle rubl
From: Dave Horsfall <dave(a)horsfall.org>
To: Computer Old Farts Followers <coff(a)tuhs.org>
Cc:
Bcc:
Date: Wed, 9 Dec 2020 13:41:11 +1100 (EST)
Subject: Re: [COFF] ARPAnet now 4 nodes
On Sat, 5 Dec 2020, Noel Chiappa wrote:
> The ARPAnet reached four nodes on this day in 1969 .. the nodes were > UCSB, UCLA, SRI, and Utah.
Yeah; see the first map here:
http://www.chiappa.net/~jnc/tech/arpageo.html
Yep; I know that first map well :-) For the newbies here, the ARPAnet
was the predecessor of the Internet (no, it didn't spring from the
brow of Zeus, nor Billy Gates), and what we now call "routers" were
then IMPs (look it up).
Missing maps gratefully received!
Indeed; history needs to be kept alive, lest it die.
-- Dave
> The ARPAnet reached four nodes on this day in 1969 ..
> the nodes were UCSB, UCLA, SRI, and Utah.
Yeah; see the first map here:
http://www.chiappa.net/~jnc/tech/arpageo.html
Missing maps gratefully received!
Noel
The ARPAnet reached four nodes on this day in 1969; at least one "history"
site reckoned the third node was connected in 1977 (and I'm still waiting
for a reply to my correction). Well, I can believe that perhaps there
were only three left by then...
According to my notes, the nodes were UCSB, UCLA, SRI, and Utah.
-- Dave
Dan Cross wrote in
<CAEoi9W63J0HKbWUk8wrGSkCdyzzaV-F6km-q+K-H2+kvURWWdQ(a)mail.gmail.com>:
|On Tue, Dec 1, 2020 at 3:40 PM Bakul Shah <bakul(a)iitbombay.org> wrote:
|
|> On Dec 1, 2020, at 12:20 PM, Steffen Nurpmeso <steffen(a)sdaoden.eu> wrote:
|>> Never without my goto:, and if it is only to break to error
|>> handling and/or staged destruction of local variables after
|>> initialization failures. Traumatic school impression, finding
|>> yourself locked in some PASCAL if condition, and no way to go to.
|>
|> Pascal had goto.
Hm, i did not receive Bakul's mail. Well i did not use it long
enough. I think this came up in the past already, it could have
been it was a mutilated version, there definetely was no goto in
this DOS-looking UI with menu bar, with menu entries for
compilation plus, help screen etc etc. Borland Pascal, Borland
dBASE it must have been then. Didn't i say "maybe the teacher had
an option to turn it on" or something :) Yeah, i do not know, but
there was no goto, definetely.
|Pascal also had to go. (Thanks...I'm here all week.)
Ah, and all the many-page program listings in Delphi, what a waste
of paper. Whether anyone really typed them out, not me.
|You can even do a non-local goto!
Help.
|> In Go you don't need goto for the sort of thing you and McVoy
|> talked about due to its defer statement and GC. Now granted
|> GC may be too big of a hammer for C/C++ but a future C/C++
|> add defer gainfully as the defer pattern is pretty common.
|> For example, mutex lock and unlock.
Terrible just as pthread_cleanup_push/pop, and that can be
entirely local-to-scope. Terrible even if there would be
"closure"s that could be used as arguments instead of a function
pointer. gcc supports/ed computed goto's, which would also be
nice in that respect. And some kind of ISO _Xy() which could be
used in conditionals dependent on whether the argument is
a computed goto, a "closure" or a function pointer (or a member
function pointer).
I always hated that C++ is not ISO C plus extensions, so your
"C/C++" is not true for a long time...
--steffen
|
|Der Kragenbaer, The moon bear,
|der holt sich munter he cheerfully and one by one
|einen nach dem anderen runter wa.ks himself off
|(By Robert Gernhardt)
Is it just me, or did console messages really wake up the screen saver on
BSDi (aka BSD/OS)? That old box has long since gone to $HEAVEN (along
with the company itself; thank you WinDriver) but I'm getting annoyed at
having to tap a key on FreeBSD to see the console, which I don't recall
having to do on BSDi.
-- Dave
The world's first computer programmer (and a mathematician, when that was
deemed unseemly for a mere woman), we lost her in 1852 from uterine
cancer.
-- Dave
[Redirecting to COFF]
On Monday, 23 November 2020 at 8:42:34 -0500, Noel Chiappa wrote:
>> On Mon, Nov 23, 2020 at 12:28 PM Erik E. Fair <fair-tuhs(a)netbsd.org> wrote:
>
>> The Honeywell DDP-516 was the computer (running specialized software
>> written by Bolt, Bernanek & Newman (BBN)) which was the initial model of
>> the ARPANET Interface Message Processors (IMP).
>
> The IMPs had a lot of custom interface hardware; sui generis serial
> interlocked host interfaces (so-called 1822), and also the high-speed modem
> interfaces. I think there was also a watchdog time, IIRC (this is all from
> memory, but the ARPANET papers from JCC cover it all).
I worked with a DDP-516 at DFVLR 46 years ago. My understanding was
that the standard equipment included two different channel interfaces.
One, the DMC (Direct Multiplexer Control, I think) proved to be just
what I needed for my program, a relatively simple tape copy program.
The input tape was analogue, unbuffered, and couldn't be stopped, so
it was imperative to accept all data as it came in from the ADC.
But the program didn't work. According to the docco, the DMC should
have reset when the transfer was complete (maybe depending on
configuration parameters), but it didn't. We called in Honeywell
support, who scratched their heads and went away, only to come back
later and say that it couldn't be fixed.
I worked around the problem in software by continually checking the
transfer count and restarting when the count reached 0. So the
program worked, but I was left wondering whether this was a design
problem or a support failure. Has anybody else worked with this
feature?
Greg
--
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I'm currently reviewing a paper about Unix and Linux, and I made the
comment that in the olden days the normal way to build an OS image for
a big computer was from source. Now I've been asked for a reference,
and I can't find one! Can anybody help?
Greg
--
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